html,body,div,p,h1,h2,h3,h4,h5,h6,ul,li,ol,dl,dt,dd,hr,br,table,img,input,button,form,tr,th,td,thead,tfoot,tbody,caption,fieldset,legend,label,header,nav,main,footer,section,aside,article,hgroup,figure,figcaption,video,audio,marquee,iframe{
  margin: 0;
  padding: 0;
}
iframe{
  display: block;
  /* 因为默认iframe是一个行内块  不好   */
}
img{
  vertical-align: top;
}
a{
  text-decoration: none;
}
ul,li,ol{
  list-style: none;
}
body{
  font-size: 12px;
  line-height: 1;
}
h1,h2,h3,h4,h5,h6,b,strong,i,em,var{
  font-weight: normal;
  font-style: normal;
}
input,button{
  outline: 0;
}
.noborder{
  border:0!important;
}
/* 但凡高度塌陷的元素  我都给他设置class名字叫clearFix */
.clearFix::after{
  content: "";
  display: block;
  clear: both;
  height: 0;
  overflow: hidden;
  visibility: hidden;
}